核波林塑造了细菌颗粒结构,并平衡了小RNA沉默通路
Kun Shi1,2, Ying Zhang1,2, Zhenzhen Du1
1Department of Biochemistry and Molecular Biology, School of Basic Medicine, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, 430032, China.
bioRxiv : the preprint server for biology
|February 3, 2025
概括
这项研究揭示了核素NPP-14和NPP-24将胚芽颗粒在核毛孔复合体上,调节C. elegans中的piRNA沉默. 破坏这种关联增强了piRNA沉默,但损害了RNAi的效率和遗传.
科学领域:
- * 分子生物学 * 分子生物学
- * 遗传学 在遗传学方面
- * 细胞生物学 细胞生物学
背景情况:
- *小RNA通路,包括piwi相互作用RNA (piRNA) 和小干扰RNA (siRNA),对于沉默动物中的核酸至关重要.
- *piRNA路径组件局部化到胚芽颗粒中,这些颗粒通常与核孔复合体 (NPC) 相结合.
- * 胚芽颗粒与NPC关联的机制和功能意义尚不清楚.
研究的目的:
- * 为了确定调解胚芽颗粒-NPC关联的因素.
- * 调查胚芽颗粒-NPC关联在piRNA沉默中的作用.
- * 了解改变细菌颗粒组织对小RNA通路的功能后果.
主要方法:
- *使用突变菌株 (例如, *npp-14*, *npp-24*, *eps-1*) 在 *C. elegans* 中进行遗传分析.
- *近距离标记实验以识别相互作用的蛋白质.
- * 细菌颗粒形态和定位的分析.
- *对小RNA群 (piRNA和siRNA) 和它们的向位点进行量化.
- *评估RNA干扰 (RNAi) 的效率和遗传性.
主要成果:
- * 保存的核波林NPP-14 (NUP-214) 和NPP-24 (NUP-88) 对于将胚芽颗粒固定在NPC中至关重要.
- * 胚芽颗粒因子EPS-1 (增强的piRNA沉默) 也有助于胚芽颗粒-NPC相互作用.
- * NPP-14,NPP-24或EPS-1的损失导致生殖粒的数量减少,扩大,混乱.
- * 突变动物在piRNA目标部位表现出二次小RNA的过度放大,表明增强的piRNA沉默.
- * 突变物中增强的piRNA沉默与减少的RNAi效率和受损的RNAi遗传相结合.
结论:
- *NPP-14,NPP-24和EPS-1是建立胚芽颗粒-NPC关联的关键因素.
- * 胚芽颗粒-NPC协会在调节piRNA和RNAi通路之间的平衡方面发挥着至关重要的作用.
- * 胚胎颗粒的空间组织对于保持小RNA路径的适当功能和遗传至关重要.
相关概念视频
Regulation of Nuclear Protein Sorting
2.4K
Nuclear protein sorting regulates nucleus composition and gene expression, crucial for determining the fate of a eukaryotic cell. Hence, the entry and exit of molecules across the nuclear envelope is a tightly controlled process. Nuclear protein sorting can be inhibited by one of the following ways: 1) masking cargo signal sequences, 2) modifying the nuclear receptor's affinity for cargo, 3) controlling the nuclear pore size, 4) retaining the cargo during its transit to the cytosol or the...
2.4K
The Nucleolus
8.7K
The nucleolus is the most prominent substructure of the nucleus. When it was first discovered, it was considered to be an isolated organelle that forms fibrils and granules. In 1931, the relationship between the nucleolus and chromosomes was first described by Heitz. He observed that the appearance and size of nucleolus varies depending on the stage of the cell cycle. He also noticed constricted regions on different chromosomes clustered together at definite cell cycle stages. These regions,...
8.7K
siRNA - Small Interfering RNAs
16.5K
Small interfering RNAs, or siRNAs, are short regulatory RNA molecules that can silence genes post-transcriptionally, as well as the transcriptional level in some cases. siRNAs are important for protecting cells against viral infections and silencing transposable genetic elements.
In the cytoplasm, siRNA is processed from a double-stranded RNA, which comes from either endogenous DNA transcription or exogenous sources like a virus. This double-stranded RNA is then cleaved by the...
In the cytoplasm, siRNA is processed from a double-stranded RNA, which comes from either endogenous DNA transcription or exogenous sources like a virus. This double-stranded RNA is then cleaved by the...
16.5K
RNA Interference
25.9K
RNA interference (RNAi) is a process in which a small non-coding RNA molecule blocks the post-transcriptional expression of a gene by binding to its messenger RNA (mRNA) and preventing the protein from being translated.
This process occurs naturally in cells, often through the activity of genomically-encoded microRNAs. Researchers can take advantage of this mechanism by introducing synthetic RNAs to deactivate specific genes for research or therapeutic purposes. For example, RNAi could be used...
This process occurs naturally in cells, often through the activity of genomically-encoded microRNAs. Researchers can take advantage of this mechanism by introducing synthetic RNAs to deactivate specific genes for research or therapeutic purposes. For example, RNAi could be used...
25.9K
piRNA - Piwi-interacting RNAs
6.8K
PIWI-interacting RNAs, or piRNAs, are the most abundant short non-coding RNAs. More than 20,000 genes have been found in humans that code for piRNAs while only 2000 genes have been found for miRNAs. piRNAs can act at the transcriptional and post-transcriptional levels and have a vital role in silencing transposable elements present in germ cells. They are also involved in epigenetic silencing and activation. Previously, they were thought to function only in germ cells but new evidence suggests...
6.8K
Nuclear Export of mRNA
7.5K
Before mRNAs are exported to the cytoplasm, it is crucial to check each mRNA for structural and functional integrity. Eukaryotic cells use several different mechanisms, collectively known as mRNA surveillance, to look for irregularities in mRNAs. Irregular or aberrant mRNA are rapidly degraded by various enzymes. If a defective mRNA escapes the surveillance, it would be translated into a protein which would either be non-functional or not function properly. One of the primary irregularities in...
7.5K


